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02312 SCALE REMOVAL AND INHIBITION IN LOW WATER CUT WELLS

Picture for 02312 SCALE REMOVAL AND INHIBITION IN...
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Product Number: 51300-02312-SG
ISBN: 02312 2002 CP
Author: Curtis Sitz, Michael Rudel, Tommy Morrison, and Bryan Phillips
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Scale inhibitor squeeze treatments are widely used to prevent scale in the near-wellbore region of the formation. In conventional squeeze treatments, a volume of brine containing a scale inhibitor is injected into the reservoir. When the well is produced, the scale inhibitor flows back in the produced water at low concentrations thus preventing scale formation. Typically, scale inhibitor squeeze treatments are conducted in wells that have a significant water cut, providing excellent protection against the formation of scale deposits. However, in wells that have low water cuts or in wells completed to water-sensitive reservoirs, aqueous scale inhibitor treatments can cause serious problems that may result in lost or deferred production. Oil soluble scale inhibitor squeezes have been used recently in high oil cut wells in the North Sea to avoid many of the problems presented by water-based squeezes. This paper describes the field implementation and results of a calcium sulfate scale removal treatment and subsequent oil soluble scale inhibitor squeezes into low water cut wells. For these wells, the treatments were designed to provide a technically and economically viable solution to a serious problem.
Scale inhibitor squeeze treatments are widely used to prevent scale in the near-wellbore region of the formation. In conventional squeeze treatments, a volume of brine containing a scale inhibitor is injected into the reservoir. When the well is produced, the scale inhibitor flows back in the produced water at low concentrations thus preventing scale formation. Typically, scale inhibitor squeeze treatments are conducted in wells that have a significant water cut, providing excellent protection against the formation of scale deposits. However, in wells that have low water cuts or in wells completed to water-sensitive reservoirs, aqueous scale inhibitor treatments can cause serious problems that may result in lost or deferred production. Oil soluble scale inhibitor squeezes have been used recently in high oil cut wells in the North Sea to avoid many of the problems presented by water-based squeezes. This paper describes the field implementation and results of a calcium sulfate scale removal treatment and subsequent oil soluble scale inhibitor squeezes into low water cut wells. For these wells, the treatments were designed to provide a technically and economically viable solution to a serious problem.
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ISBN: 00118 2000 CP
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02311 DEVELOPMENT OF A SCALE INHIBITOR FOR AN UNUSUAL PRODUCED WATER

Product Number: 51300-02311-SG
ISBN: 02311 2002 CP
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02405 A CONVENIENT, LOW COST LABORATORY PROTOCOL FOR SCREENING SCALE INHIBITORS

Product Number: 51300-02405-SG
ISBN: 02405 2002 CP
Author: D. P. Wyman, R. D. Moll, J. D. Fox, F. J. Grad, and V. Mihalitsas
Publication Date: 2002
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A convenient protocol for screening the potential efficacy of scale inhibitors is described. All of the techniques used require relatively inexpensive equipment. Two types of scale are addressed in this paper, calcium carbonate and calcium oxalate, but the general procedures are expected to be applicable to inhibitor screening for others as well.
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